I managed to do what I needed to do using Inkscape.
Moral of the story: "If you have a nail, even the best screwdriver isn't much good."
Thanks to both of you for your time and suggestions.
P.S. I'm not sure how to mark this "solved". It isn't under Thread Tools as it used to be.
No, that button has disappeared because of some sort of software incompatibility. See this thread (post 2) for a workaround: http://ubuntuforums.org/showthread.php?t=2121377
OK. Got it.
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